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package org.glassfish.admin.rest.resources.custom;

import com.sun.enterprise.server.logging.logviewer.backend.LogFilter;

import org.glassfish.hk2.api.ServiceLocator;
import org.glassfish.internal.api.Globals;
import org.glassfish.internal.api.LogManager;

import jakarta.ws.rs.GET;
import jakarta.ws.rs.Produces;
import jakarta.ws.rs.core.MediaType;
import java.io.IOException;
import java.util.List;
import jakarta.ws.rs.QueryParam;
import jakarta.ws.rs.core.Response;

/**
 * REST resource to get Log Names
 * simple wrapper around internal  LogFilter  class
 *
 * @author ludovic Champenois
 */
public class LogNamesResource {

    protected ServiceLocator habitat = Globals.getDefaultBaseServiceLocator();

    @GET
    @Produces({MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML})
    public Response getLogNames(@QueryParam("instanceName") String instanceName) throws IOException {
        
        if (instanceName == null || instanceName.equals(""))  {
            return Response.serverError().entity("instanceName is a required attribute").build();
        }
        
        LogNameList returnedNames = getInstanceLogFileNames(instanceName);
        
        return Response.ok(returnedNames).build();
    }

    private LogNameList getInstanceLogFileNames(String instanceName) throws IOException {

        if (habitat.getService(LogManager.class) == null) {
            //the logger service is not install, so we cannot rely on it.
            //return an error
            throw new IOException("The GlassFish LogManager Service is not available. Not installed?");
        }

        LogFilter logFilter = habitat.getService(LogFilter.class);
        
        List<String> logNameList = logFilter.getInstanceLogFileNames(instanceName);

        return new LogNameList(logNameList);

    }
}
